JPH05290424A - Magneto-optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the reduction of electric power consumption, the reduction of the wear of a magnetic head, etc., of the magneto-optical recording and reproducing device of a magnetic field modulation system. CONSTITUTION:Recording is executed by disposing an optical pickup 33 on one surface side of a magneto-optical disk 1, disposing the magnetic head 35 for magnetic field modulation recording on the other surface side and sliding the magnetic head 35 in contact with the magneto-optical disk 1. This magneto- optical recording and reproducing device is so constituted that the magnetic head 35 is supported via a hinge part 38 to a support 32 of the optic al pickup 33 moving along a seek shaft 43 and that the magnetic head 35 is parted from the surface of the magneto-optical disk 1 at the time of signal reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording / reproducing device.

2. Description of the Related Art Conventionally, as a recording system for a magneto-optical disk, a magnetic field modulation type magneto-optical recording system is known which enables overwriting by overwriting a new signal on an old signal. In this recording method, as shown in FIG. 8, an optical head, that is, an optical pickup, which irradiates a laser beam 6 on one side with a magneto-optical disk 1 having a magneto-optical recording layer of a perpendicular magnetization film sandwiched, is synchronized with a laser spot on the other. The moving magnetic field generating means, that is, the magnetic head 7 is provided, and the direction of the magnetic field is changed by changing the direction of the current flowing through the magnetic head 7.
Then, a magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot, so that the rewritable portion 1 of the disk 1 is desired.
When A is heated to a Curie temperature or higher by the laser spot 6a to be demagnetized and then moves from the laser spot 6a and is lowered to the Curie temperature or lower, it is magnetized in the above magnetic field direction for recording.

The conventional magneto-optical disk 1 is a non-contact medium, and therefore the magnetic head 7 is arranged away from the disk 1 by a necessary and sufficient distance d ₀ .

As shown in FIG. 9, a magneto-optical disk 1 is usually provided with a magneto-optical recording layer 3 made of a perpendicular magnetization film on a transparent substrate 2 with a SiN protective film 8 interposed therebetween.
A reflective film 4 made of a metal thin film, for example, an aluminum thin film is laminated on the SiN protective film 8 via a SiN protective film 8, and a protective film 5 made of an ultraviolet curable resin or the like is further formed on the reflective film 4.

[0004]

The present applicant has previously developed a microminiature digital recording / reproducing apparatus capable of digital recording / reproducing with a microminiature magneto-optical disk. This recording / reproducing apparatus adopts a magnetic field modulation type magneto-optical recording system to enable overwriting.

By the way, since the conventional magneto-optical disk records in a non-contact manner as described above, the magnetic head 7 for magneto-optical recording follows the surface wobbling of the disk 1 caused by the rotation while being separated from the disk 1. Is attached to the electromagnetic servo mechanism. For this reason, in a recording / reproducing apparatus that employs a non-contact method with respect to a magneto-optical disk, power consumption is reduced and the device is downsized (especially, the thickness of the device is reduced).
There is a limit.

Therefore, if a contact system in which the magnetic head is brought into contact with and slides on the magneto-optical disk is adopted, the magnetic head need only be supported by a simple elastic support, and the conventional electromagnetic servo mechanism having a large volume can be omitted. This is advantageous in reducing the power consumption of the recording / reproducing apparatus and downsizing the device.

FIG. 7 shows an example of a main part of a recording / reproducing apparatus which makes this possible. The recording / reproducing apparatus 11 is held by an optical pickup 13 provided on a support 12 so as to face one surface of the disk 1 and an elastic support 14 so as to contact the other surface of the disk 1. Magnetic head 1
5, the support 12 and the elastic support 14 are fixed members 1
6 are integrally attached and configured. Elastic support 1
4, the elasticity is imparted by, for example, a part of the thin portion 17. A spring 18 is mounted on the elastic support 14, and a spring holder 19 keeps the magnetic head 15 in contact with the other surface of the disk 1, that is, the surface on which the protective film 5 is formed. Reference numeral 20 denotes a stopper portion for limiting the elastic displacement amount of the elastic support body 14.

The support 12 of the optical pickup 13 is movably attached to the seek shaft 22, and the optical pickup 13 and the magnetic head 15 are adapted to move in the radial direction a of the disk 1 along the seek shaft 22. ..

The recording / reproducing apparatus 11 is constructed so that the magnetic head 15 contacts the disk 1 during recording and reproduction. Therefore, since it is not necessary to provide a mechanism for moving the magnetic head during recording and reproduction, the structure is simplified, the size can be reduced, the number of parts can be reduced, and the cost can be reduced.

However, even when the signal is reproduced, the magnetic head 15 is in contact with the disk surface, so that the magnetic head 15 is easily worn and the motor for rotating the disk 1 is constantly loaded with power. And the magnetic head 15 is in contact with the disk 1 and the disk surface has bumps or the like, the servo on the optical pickup side is disturbed.

In view of the above points, the present invention provides a magneto-optical recording / reproducing apparatus which solves the above problems such as reduction of power consumption and wear of a magnetic head.

[0012]

According to the present invention, an optical head 33 is arranged on one surface side of a recording medium 1 and a magnetic head 35 for magnetic field modulation recording is arranged on the other surface side thereof.
In a magneto-optical recording / reproducing apparatus that performs sliding contact with the recording medium 1 to perform recording, a magnetic head 35 is supported via a hinge portion 38 with respect to a support body 32 of an optical head 33 that moves along a seek axis 43. To configure.

As the hinge portion, for example, the plunger 6
It can be configured to open and close using 0,65.

Further, the hinge portion may be constructed so as to be opened and closed by using a cam 68.

[0015]

In the present invention, since the magnetic head 35 is supported by the support 32 of the optical head 33 via the hinge portion 38, the hinge portion 38 is closed at the time of signal recording and the magnetic head 35 is placed on the recording medium 1. Recording is carried out by sliding contact, and at the time of signal reproduction, the hinge portion 38 is opened to separate the magnetic head 35 from the surface of the recording medium. As a result, during signal reproduction, no load is applied to the drive motor for rotating the recording medium, so that power consumption is reduced. Particularly, in a small recording / reproducing apparatus, the life of the battery used as a power source is extended.

Further, the wear of the magnetic head 35 is reduced and the risk of damage to the recording medium 1 is greatly reduced. Further, since the magnetic head 35 is not in contact during signal reproduction, the speed of random access, high speed research, etc. can be increased.

[0017]

Embodiments of the magneto-optical recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a magneto-optical disk, 31
Shows a magneto-optical recording / reproducing apparatus according to this example, and in particular, a main part thereof. The magneto-optical recording / reproducing device 31 includes an optical head, that is, an optical pickup 33 provided on a support 32 so as to face one surface with the disk 1 interposed therebetween, and an elastic support 34 so as to contact the other surface. A magnetic head 35 held at the tip of each support body 32 and elastic support body 3
4 is fixed to the first and second mounting portions 36 and 37, and the elastic mounting body 34 including the magnetic head 35 can be opened and closed with respect to the supporting body 32 of the optical pickup 33. The second mounting portion 37 is rotatably supported by 36 via a shaft 38 serving as a hinge portion.

The opening and closing of the elastic support 34 is for separating the magnetic head 35 from the disk 1 at the time of signal reproduction. The distance L from the disk 1 is the variation of the mechanical setting position of the disk and the rotation of the disk 1. It is necessary to add 0.7 mm or more in consideration of the shake amount at the time (see FIG. 2).

The elastic support 34 is, for example, a part of the thin portion 3
9 imparts elasticity. A spring 40 is mounted on the elastic support 43 in the vicinity of the magnetic head 35, and a spring holder 41 contacts the magnetic head 35 with the surface of the disk 1, that is, the surface on which the protective film 5 is formed. Reference numeral 41 denotes a stopper portion integrally provided on the spring retainer in order to limit the amount of elastic displacement of the elastic support 34.

The support 32 of the optical pickup 33 is movably attached to the seek shaft 43, and the optical pickup 13 and the magnetic head 35 are synchronized with each other and the disk 1
Is configured to move along the radial direction a.

For example, as shown in FIG. 6, the magnetic head 35 is formed integrally with a magnetic core 51, a bobbin 53 mounted on the magnetic core 51 and wound with a coil 52, and an end portion of the bobbin 53. And the sliding portion 54 that comes into contact with the disk 1
And have. The magnetic core 51 is formed of a ferrite core having an E-shaped cross section, which includes a central magnetic pole core 55 and a side magnetic pole core 56 surrounding the central magnetic pole core 55. The bobbin 53 has a flange portion 5 at one end.
7 and a sliding portion 54 is integrally formed at the other end,
The coil 52 is wound between the flange portion 57 and the sliding portion 54. The bobbin 53 around which the coil 52 is wound is attached to the magnetic core 51 so that the central magnetic pole core 55 is inserted into the central hole. At this time, the end portions of the central magnetic pole core 55 and the side magnetic pole core 56 are covered with the sliding portion 54,
Not exposed to the outside. The bobbin 53 having the flange portion and the sliding portion 54 may be integrally formed by injection molding of resin.

As a drive mechanism for opening and closing the elastic support 34 around the shaft 38 serving as the hinge, the following FIG.
~ It can be configured as shown in FIG. 5 (all schematic).

For example, in the example of FIG. 3, the optical pickup 3
The micro-plunger 60 is fixedly arranged on the support body 32 on the third side, and the elongated pin of the operating rod 61 is engaged with the engagement pin 63 provided at one end of the mounting portion 37 of the elastic support body 34. The attachment portion 37 is rotatable about the shaft 38, and the tension spring 64 is provided between the elastic support body 34 and the support body 32.
To configure.

In this structure, when the microplunger 60 is driven in the direction of the arrow a ₁ , the elastic support member 34 rotates clockwise about the shaft 38 to separate the magnetic head 35 from the surface of the disk 1. Next, when the microplunger 60 is driven in the direction of the arrow a ₂ , the elastic support 3
4 rotates counterclockwise about the shaft 38, and the magnetic head 35 comes into contact with the surface of the disk 1.

In the example of FIG. 4, the micro-plunger 65 is arranged between the support 32 on the optical pickup 33 side and the elastic support 34 supporting the magnetic head 35, and the tip of the operating rod 66 of the micro-plunger 65 is elastically supported. It is configured so as to come into contact with the body 34, and a tension spring 64 is interposed between the support body 32 and the elastic support body 34. In this case, the mounting portion 37 of the elastic support body 34 is rotatably supported by the mounting portion 36 of the support body 32 via the shaft 38.

In the case of this structure, the micro-plunger 65 is driven in the direction of the arrow b ₁ so that the elastic support 34 is rotated in the clockwise direction and the magnetic head 35 can be separated from the surface of the disk 1. .. On the contrary, when the micro-plunger 65 is driven in the direction of the arrow b _{2, the} elastic support 34 is rotated in the counterclockwise direction to move the magnetic head 35 of the magnetic head 35 to the disk 1.
Can be brought into contact with the surface of.

Further, in the example of FIG. 5, a tension spring 64 is interposed between the support 32 and the elastic support 34, and a cam 68 driven by a so-called rotary plunger has its cam surface abutting the elastic support 34. To arrange. By driving the cam 68, at the rotational position of the cam 68, the elastic support member 34 is brought to the solid line position, the magnetic head 34 comes into contact with the surface of the disk 1, and the cam 68 moves.
At the other rotation position, the elastic support 35 is rotated to the chain line position so that the magnetic head 35 is separated from the surface of the disk 1.

As described above, various mechanisms can be used to open and close the elastic support 34.

In the above structure, the magnetic head 35 is slid on the surface of the disk 1 for recording during signal recording. Then, at the time of signal reproduction, the elastic support 34 is rotated in the opening direction about the shaft 8 constituting the hinge portion to separate the magnetic head 35 from the surface of the disk 1, and the signal reproduction is performed in that state.

According to this structure, since the magnetic head 35 is separated from the disk surface during signal reproduction, the load on the rotary motor for rotating the disk 1 is reduced and the current consumption can be reduced. Especially in portable recording / playback devices, a battery is used as a power source.
The life of the battery can be greatly extended. Further, since the magnetic head 35 is not in contact with the disk 1 during signal reproduction, the wear of the magnetic head 35 can be greatly reduced, and at the same time, the risk of damage to the disk surface can be reduced. In addition, since there is no contact during reproduction, there is an advantage that the speed in random access, high-speed search, etc. can be increased.

Although the shaft 38 is used as the hinge portion in the above example, various hinge structures such as a hinge portion using a thin portion can be applied.

[0033]

According to the present invention, in a recording / reproducing apparatus equipped with a contact sliding type magnetic head, the magnetic head is brought into contact sliding contact with the surface of the disk during the signal recording, and the magnetic head is recorded during the signal reproducing. By making the recording medium separate from the medium, the load on the motor for rotating the recording medium can be reduced, and the power consumption can be reduced. Especially for portable devices,
The life of the battery can be greatly extended.

Since the magnetic head is in a non-contact state during signal reproduction, the wear of the magnetic head can be greatly reduced, and at the same time, the risk of scratching the recording medium can be reduced.

Further, there is a real advantage that the speed at the time of random access, high speed search, etc. can be increased. Therefore, it is suitable for application to a microminiature magneto-optical recording / reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a magneto-optical recording / reproducing apparatus according to the present invention.

FIG. 2 is an operation state diagram during reproduction of the magneto-optical recording / reproducing apparatus according to the present invention.

FIG. 3 is a schematic configuration diagram showing an example of an opening / closing drive unit of a hinge unit according to the present invention.

FIG. 4 is a schematic configuration diagram showing another example of the opening / closing drive section of the hinge section according to the present invention.

FIG. 5 is a schematic configuration diagram showing still another example of the opening / closing drive section of the hinge section according to the present invention.

FIG. 6 is a sectional view showing an example of a magnetic head according to the present invention.

FIG. 7 is a configuration diagram showing a comparative example of a magneto-optical recording / reproducing apparatus.

FIG. 8 is an explanatory diagram of a magnetic field modulation method.

FIG. 9 is a sectional view of a magneto-optical disk.

[Explanation of symbols]

 1 Magneto-optical disk 11,31 Magneto-optical recording / reproducing device 12,32 Support 13,33 Optical pickup 14,34 Elastic support 15,35 Magnetic head 16 Fixing member 18,40 Spring 19,41 Spring retainer 20,41 Stopper part 36,37 Mounting part 38 Shaft (hinge part) 22,43 Seek shaft 51 Magnetic core 52 Coil 53 Bobbin 54 Sliding part 60,65 Micro plunger 61,66 Operating rod 64 Tension spring 68 Cam

Claims (3)

[Claims] 1. An optical head is arranged on one surface side of a recording medium, and a magnetic head for magnetic field modulation recording is arranged on the other surface side, and the magnetic head is slid on the recording medium to perform recording. In the magneto-optical recording / reproducing apparatus for performing, the magnetic head is supported via a hinge portion with respect to a support body of the optical head moving along a seek axis. 2. The magneto-optical recording / reproducing apparatus according to claim 1, wherein the hinge portion is opened and closed by using a plunger. 3. The magneto-optical recording / reproducing apparatus according to claim 1, wherein the hinge portion is opened and closed by using a cam.